/Engine/Source/Developer/SharedSettingsWidgets/Public/SSettingsEditorCheckoutNotice.h
Called when the the file was probably modified externally (only detects files that were 'ready to go' and are now not, e.g., reverted/checked in or files with the read-only flag edited outside)
WidgetArgsType & OnFileProbablyModifiedExternally &40; const FSimpleDelegate & InDelegate &41;